20!!
= 20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 ×2
= 3.715.891.200
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20!!
= 20 × 18 × 16 × 14 × 12 × 10 × 8 × 6 × 4 ×2
= 3.715.891.200